DTC C0550. Holden WM Sedan 2008

For 1990-2009 cars only

Makes 🢒 Holden 🢒 2008 🢒 WM Sedan 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC C0550

DTC C0550 HSV

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC C0550 31: Electronic Control Unit (ECU) Malfunction/Performance. - General Checksum Failure

DTC C0550 32: Electronic Control Unit (ECU) Malfunction/Performance. - General Memory Failure

DTC C0550 38: Electronic Control Unit (ECU) Malfunction/Performance. - Supervision Software Failure

DTC C0550 39: Electronic Control Unit (ECU) Malfunction/Performance. - Internal Electronic Failure/Discard

Circuit/System Description

When the ignition is ON, the electronic suspension control (ESC) module monitors communications between its internal microprocessors and performs self-diagnostic tests. If an internal malfunction is detected, the ESC module will store a DTC C0550 in its memory.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

•	The ESC module detected an internal malfunction.

•	The malfunction must be detected when the ignition switch is first turned on.

Action Taken When the DTC Sets

•	The ESC module illuminates the LED in the ESC switch.

•	The ESC module disables all ESC functionality.

Conditions for Clearing the DTC

•	Under all fault conditions, the ignition must be cycled before this DTC can be changed from current to history.

•	The ESC module no longer detects any internal malfunctions when the ignition is first turned to the ON position.

•	A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

•	Using a TECH2 Scan Tool Unit.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics .

ESC Malfunction Indicator Lamp

When all DTC's are cleared, and the Diagnostic System Check - Vehicle has been performed the ESC malfunction indicator lamp may stay illuminated for a period of up to 5 seconds when the ignition switch is moved to the "off" position. The ESC malfunction indicator lamp should switch off when the ignition is switched to the "on" position.

Connector End View Reference

Component Connector End Views .

Electrical Information Reference

•	Circuit Testing .

•	Testing for Intermittent Conditions and Poor Connections .

•	Wiring Repairs .

Scan Tool Reference

Control Module References

Circuit/System Verification

Verify that no other DTCs are present, if any other DTCs are present diagnose those DTCs prior to any circuit or component testing.
Verify that DTC C0550 is not set.

⇒	If the DTC, is set replace the ESC.